mirror of
https://we.phorge.it/source/arcanist.git
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429 lines
12 KiB
PHP
Executable file
429 lines
12 KiB
PHP
Executable file
#!/usr/bin/env php
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<?php
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/*
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* Copyright 2012 Facebook, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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// We have to do this first before we load any symbols, because we define the
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// builtin symbol list through introspection.
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$builtins = phutil_symbols_get_builtins();
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require_once dirname(__FILE__).'/__init_script__.php';
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$args = new PhutilArgumentParser($argv);
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$args->setTagline('identify symbols in a PHP source file');
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$args->setSynopsis(<<<EOHELP
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**phutil_symbols.php** [__options__] __path.php__
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Identify the symbols (clases, functions and interfaces) in a PHP
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source file. Symbols are divided into "have" symbols (symbols the file
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declares) and "need" symbols (symbols the file depends on). For example,
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class declarations are "have" symbols, while object instantiations
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with "new X()" are "need" symbols.
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Dependencies on builtins and symbols marked '@phutil-external-symbol'
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in docblocks are omitted without __--all__.
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Symbols are reported in JSON on stdout.
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This script is used internally by libphutil/arcanist to build maps of
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library symbols.
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It would be nice to eventually implement this as a C++ xhpast binary,
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as it's relatively stable and performance is currently awful
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(500ms+ for moderately large files).
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EOHELP
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);
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$args->parseStandardArguments();
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$args->parse(
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array(
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array(
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'name' => 'all',
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'help' => 'Report all symbols, including builtins and declared '.
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'externals.',
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),
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array(
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'name' => 'ugly',
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'help' => 'Do not prettify JSON output.',
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),
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array(
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'name' => 'path',
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'wildcard' => true,
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'help' => 'PHP Source file to analyze.',
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),
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));
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$paths = $args->getArg('path');
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if (count($paths) !== 1) {
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throw new Exception("Specify exactly one path!");
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}
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$path = Filesystem::resolvePath(head($paths));
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$show_all = $args->getArg('all');
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$source_code = Filesystem::readFile($path);
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$tree = XHPASTTree::newFromData($source_code);
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$root = $tree->getRootNode();
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$root->buildSelectCache();
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// -( Marked Externals )------------------------------------------------------
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// Identify symbols marked with "@phutil-external-symbol", so we exclude them
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// from the dependency list.
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$externals = array();
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$doc_parser = new PhutilDocblockParser();
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foreach ($root->getTokens() as $token) {
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if ($token->getTypeName() == 'T_DOC_COMMENT') {
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list($block, $special) = $doc_parser->parse($token->getValue());
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$ext_list = idx($special, 'phutil-external-symbol');
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$ext_list = explode("\n", $ext_list);
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$ext_list = array_filter($ext_list);
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foreach ($ext_list as $ext_ref) {
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$matches = null;
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if (preg_match('/^\s*(\S+)\s+(\S+)/', $ext_ref, $matches)) {
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$externals[$matches[1]][$matches[2]] = true;
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}
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}
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}
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}
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// -( Declarations and Dependencies )-----------------------------------------
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// The first stage of analysis is to find all the symbols we declare in the
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// file (like functions and classes) and all the symbols we use in the file
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// (like calling functions and invoking classes). Later, we filter this list
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// to exclude builtins.
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$have = array(); // For symbols we declare.
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$need = array(); // For symbols we use.
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$xmap = array(); // For extended classes and implemented interfaces.
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// -( Functions )-------------------------------------------------------------
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// Find functions declared in this file.
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// This is "function f() { ... }".
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$functions = $root->selectDescendantsOfType('n_FUNCTION_DECLARATION');
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foreach ($functions as $function) {
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$name = $function->getChildByIndex(2);
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if ($name->getTypeName() == 'n_EMPTY') {
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// This is an anonymous function; don't record it into the symbol
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// index.
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continue;
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}
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$have[] = array(
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'type' => 'function',
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'symbol' => $name,
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);
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}
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// Find functions used by this file. Uses:
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//
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// - Explicit Call
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// - String literal passed to call_user_func() or call_user_func_array()
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//
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// TODO: Possibly support these:
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//
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// - String literal in ReflectionFunction().
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// This is "f();".
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$calls = $root->selectDescendantsOfType('n_FUNCTION_CALL');
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foreach ($calls as $call) {
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$name = $call->getChildByIndex(0);
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if ($name->getTypeName() == 'n_VARIABLE' ||
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$name->getTypeName() == 'n_VARIABLE_VARIABLE') {
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// Ignore these, we can't analyze them.
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continue;
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}
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if ($name->getTypeName() == 'n_CLASS_STATIC_ACCESS') {
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// These are "C::f()", we'll pick this up later on.
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continue;
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}
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$call_name = $name->getConcreteString();
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if ($call_name == 'call_user_func' ||
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$call_name == 'call_user_func_array') {
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$params = $call->getChildByIndex(1)->getChildren();
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if (!count($params)) {
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// This is a bare call_user_func() with no arguments; just ignore it.
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continue;
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}
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$symbol = array_shift($params);
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$symbol_value = $symbol->getStringLiteralValue();
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if ($symbol_value) {
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$need[] = array(
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'type' => 'function',
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'name' => $symbol_value,
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'symbol' => $symbol,
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);
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}
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} else {
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$need[] = array(
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'type' => 'function',
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'symbol' => $name,
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);
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}
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}
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// -( Classes )---------------------------------------------------------------
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// Find classes declared by this file.
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// This is "class X ... { ... }".
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$classes = $root->selectDescendantsOfType('n_CLASS_DECLARATION');
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foreach ($classes as $class) {
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$class_name = $class->getChildByIndex(1);
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$have[] = array(
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'type' => 'class',
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'symbol' => $class_name,
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);
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}
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// Find classes used by this file. We identify these:
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//
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// - class ... extends X
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// - new X
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// - Static method call
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// - Static property access
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// - Use of class constant
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//
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// TODO: Possibly support these:
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//
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// - typehints
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// - instanceof
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// - catch
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// - String literal in ReflectionClass().
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// - String literal in array literal in call_user_func()/call_user_func_array()
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// This is "class X ... { ... }".
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$classes = $root->selectDescendantsOfType('n_CLASS_DECLARATION');
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foreach ($classes as $class) {
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$class_name = $class->getChildByIndex(1)->getConcreteString();
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$extends = $class->getChildByIndex(2);
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foreach ($extends->selectDescendantsOfType('n_CLASS_NAME') as $parent) {
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$need[] = array(
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'type' => 'class',
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'symbol' => $parent,
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);
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// Track all 'extends' in the extension map.
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$xmap[$class_name][] = $parent->getConcreteString();
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}
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}
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// This is "new X()".
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$uses_of_new = $root->selectDescendantsOfType('n_NEW');
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foreach ($uses_of_new as $new_operator) {
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$name = $new_operator->getChildByIndex(0);
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if ($name->getTypeName() == 'n_VARIABLE' ||
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$name->getTypeName() == 'n_VARIABLE_VARIABLE') {
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continue;
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}
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$need[] = array(
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'type' => 'class',
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'symbol' => $name,
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);
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}
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// This covers all of "X::$y", "X::y()" and "X::CONST".
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$static_uses = $root->selectDescendantsOfType('n_CLASS_STATIC_ACCESS');
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foreach ($static_uses as $static_use) {
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$name = $static_use->getChildByIndex(0);
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if ($name->getTypeName() != 'n_CLASS_NAME') {
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continue;
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}
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$name_concrete = $name->getConcreteString();
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$magic_names = array(
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'static' => true,
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'parent' => true,
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'self' => true,
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);
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if (isset($magic_names[$name_concrete])) {
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continue;
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}
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$need[] = array(
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'type' => 'class',
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'symbol' => $name,
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);
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}
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// -( Interfaces )------------------------------------------------------------
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// Find interfaces declared in ths file.
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// This is "interface X .. { ... }".
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$interfaces = $root->selectDescendantsOfType('n_INTERFACE_DECLARATION');
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foreach ($interfaces as $interface) {
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$interface_name = $interface->getChildByIndex(1);
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$have[] = array(
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'type' => 'interface',
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'symbol' => $interface_name,
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);
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}
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// Find interfaces used by this file. We identify these:
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//
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// - class ... implements X
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// - interface ... extends X
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// This is "class X ... { ... }".
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$classes = $root->selectDescendantsOfType('n_CLASS_DECLARATION');
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foreach ($classes as $class) {
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$class_name = $class->getChildByIndex(1)->getConcreteString();
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$implements = $class->getChildByIndex(3);
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$interfaces = $implements->selectDescendantsOfType('n_CLASS_NAME');
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foreach ($interfaces as $interface) {
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$need[] = array(
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'type' => 'interface',
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'symbol' => $interface,
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);
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// Track 'class ... implements' in the extension map.
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$xmap[$class_name][] = $interface->getConcreteString();
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}
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}
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// This is "interface X ... { ... }".
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$interfaces = $root->selectDescendantsOfType('n_INTERFACE_DECLARATION');
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foreach ($interfaces as $interface) {
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$interface_name = $interface->getChildByIndex(1)->getConcreteString();
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$extends = $interface->getChildByIndex(2);
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foreach ($extends->selectDescendantsOfType('n_CLASS_NAME') as $parent) {
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$need[] = array(
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'type' => 'interface',
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'symbol' => $parent,
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);
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// Track 'interface ... extends' in the extension map.
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$xmap[$interface_name][] = $parent->getConcreteString();
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}
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}
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// -( Analysis )--------------------------------------------------------------
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$declared_symbols = array();
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foreach ($have as $key => $spec) {
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$name = $spec['symbol']->getConcreteString();
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$declared_symbols[$spec['type']][$name] = $spec['symbol']->getOffset();
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}
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$required_symbols = array();
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foreach ($need as $key => $spec) {
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$name = idx($spec, 'name');
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if (!$name) {
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$name = $spec['symbol']->getConcreteString();
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}
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$type = $spec['type'];
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if (!$show_all) {
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if (!empty($externals[$type][$name])) {
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// Ignore symbols declared as externals.
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continue;
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}
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if (!empty($builtins[$type][$name])) {
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// Ignore symbols declared as builtins.
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continue;
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}
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}
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if (!empty($required_symbols[$type][$name])) {
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// Report only the first use of a symbol, since reporting all of them
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// isn't terribly informative.
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continue;
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}
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if (!empty($declared_symbols[$type][$name])) {
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// We declare this symbol, so don't treat it as a requirement.
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continue;
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}
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$required_symbols[$type][$name] = $spec['symbol']->getOffset();
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}
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$result = array(
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'have' => $declared_symbols,
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'need' => $required_symbols,
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'xmap' => $xmap,
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);
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// -( Output )----------------------------------------------------------------
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if ($args->getArg('ugly')) {
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echo json_encode($result);
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} else {
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$json = new PhutilJSON();
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echo $json->encodeFormatted($result);
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}
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// -( Library )---------------------------------------------------------------
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function phutil_symbols_get_builtins() {
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$builtin_classes = get_declared_classes();
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$builtin_interfaces = get_declared_interfaces();
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$builtin_functions = get_defined_functions();
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$builtin_functions = $builtin_functions['internal'];
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return array(
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'class' => array_fill_keys($builtin_classes, true) + array(
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'PhutilBootloader' => true,
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),
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'function' => array_filter(
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array(
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'empty' => true,
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'isset' => true,
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'die' => true,
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// These are provided by libphutil but not visible in the map.
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'phutil_is_windows' => true,
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'phutil_load_library' => true,
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'phutil_is_hiphop_runtime' => true,
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// HPHP/i defines these functions as 'internal', but they are NOT
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// builtins and do not exist in vanilla PHP. Make sure we don't mark
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// them as builtin since we need to add dependencies for them.
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'idx' => false,
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'id' => false,
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) + array_fill_keys($builtin_functions, true)),
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'interface' => array_fill_keys($builtin_interfaces, true),
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);
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}
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